Working with imperial units?

Take a look at Martin Fowler's Money pattern from Patterns of Enterprise Application Architecture - it is directly applicable to this situation. Recommended reading. Fowler has also posted a short writeup on his site of the Quantity pattern, a more generic version of Money.

I would definitely consider adding a Units property to the distance class. You could then overload the +, -, *, / (and related) operators so that arithmetic operations on distances is only possible when the units are the same type.

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